Magneto‐Optical Investigations on p‐InSb Bicrystals in the Submillimeter Wavelength Range

Abstract

AbstractThe magneto‐optical properties of p‐type InSb bicrystals are investigated in the submillimeter wavelength range from λ = 57 to 251 μm at temperatures T ≦ 4.2 K and magnetic fields up to B = 6.5 T. At wavelengths λ = 118.8 and 251 μm the cyclotron resonance of the conduction electrons in the n‐inversion layer adjacent to the grain boundary can be detected. At all other wavelengths strong magnetic field dependent absorption effects in the p‐type bulk mask the relatively small absorption effects in the inversion layer. The acceptor excitation spectrum of the bulk is discussed. From the periodicity of quantum oscillations three occupied electric subbands are identified. The experimental cyclotron resonance spectra are modeled as the superposition of three cyclotron resonance lines belonging to the three occupied electric subbands. Cyclotron masses are obtained with a three‐level model in the triangular‐well approximation and compared to the experimental data.